干旱区生态环境知识资源中心(Arid): The Lake CHAd Deep DRILLing project (CHADRILL) - targeting similar to 10 million years of environmental and climate change in Africa

Arid

DOI	10.5194/sd-24-71-2018
	The Lake CHAd Deep DRILLing project (CHADRILL) - targeting similar to 10 million years of environmental and climate change in Africa
	Sylvestre, Florence; Schuster, Mathieu; Vogel, Hendrik; Abdheramane, Moussa; Ariztegui, Daniel; Salzmann, Ulrich; Schwalb, Antje; Waldmann, Nicolas
通讯作者	Sylvestre, F
来源期刊	SCIENTIFIC DRILLING
ISSN	1816-8957
EISSN	1816-3459
出版年	2018
卷号	24 页码:71-78
英文摘要	At present, Lake Chad (similar to 13 degrees'N, similar to 14 degrees E) is a shallow freshwater lake located in the Sahel/Sahara region of central northern Africa. The lake is primarily fed by the Chari-Logone river system draining a similar to 600 000 km(2) watershed in tropical Africa. Discharge is strongly controlled by the annual passage of the intertropical convergence zone (ITCZ) and monsoon circulation leading to a peak in rainfall during boreal summer. During recent decades, a large number of studies have been carried out in the Lake Chad Basin (LCB). They have mostly focused on a patchwork of exposed lake sediments and outcrops once inhabited by early hominids. A dataset generated from a 673m long geotechnical borehole drilled in 1973, along with outcrop and seismic reflection studies, reveal several hundred metres of Miocene-Pleistocene lacustrine deposits. CHADRILL aims to recover a sedimentary core spanning the Miocene-Pleistocene sediment succession of Lake Chad through deep drilling. This record will provide significant insights into the modulation of orbitally forced changes in northern African hydroclimate under different climate boundary conditions such as high CO2 and absence of Northern Hemisphere ice sheets. These investigations will also help unravel both the age and the origin of the lake and its current desert surrounding. The LCB is very rich in early hominid fossils (Australopithecus bahrelghazali; Sahelanthropus tchadensis) of Late Miocene age. Thus, retrieving a sediment core from this basin will provide the most continuous climatic and environmental record with which to compare hominid migrations across northern Africa and has major implications for understanding human evolution. Furthermore, due to its dramatic and episodically changing water levels and associated depositional modes, Lake Chad's sediments resemble maybe an analogue for lake systems that were once present on Mars. Consequently, the study of the subsurface biosphere contained in these sediments has the potential to shed light on microbial biodiversity present in this type of depositional environment. We propose to drill a total of similar to 1800m of poorly to semi-consolidated lacustrine, fluvial, and eolian sediments down to bedrock at a single on-shore site close to the shoreline of present-day Lake Chad. We propose to locate our drilling operations on-shore close to the site where the geotechnical Bol borehole (13 degrees 28'N, 14 degrees 44'E) was drilled in 1973. This is for two main reasons: (1) nowhere else in the Chad Basin do we have such detailed information about the lithologies to be drilled; and (2) the Bol site is close to the depocentre of the Chad Basin and therefore likely to provide the stratigraphically most continuous sequence.
类型	Article
语种	英语
开放获取类型	Green Accepted, Other Gold, Green Published
收录类别	ESCI
WOS记录号	WOS:000447838900006
WOS关键词	LATE MIOCENE ; SAHARA-DESERT ; PLIOCENE ; BASIN ; REMOTE
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333031
作者单位	[Sylvestre, Florence] Aix Marseille Univ, CNRS, IRD, Coll France,INRA,CEREGE,Europole Arbois, F-13545 Aix En Provence, France; [Schuster, Mathieu] Univ Strasbourg, CNRS, Inst Phys Globe Strasbourg, 1 Rue Blessig, F-67084 Strasbourg, France; [Vogel, Hendrik] Univ Bern, Inst Geol Sci, Baltzerstr 1 3, CH-3012 Bern, Switzerland; [Vogel, Hendrik] OCCR, Baltzerstr 1 3, CH-3012 Bern, Switzerland; [Abdheramane, Moussa] Univ NDjamena, Fac Sci Exactes & Appl, Route Farcha, Ndjamena, Chad; [Ariztegui, Daniel] Univ Geneva, Dept Earth Sci, Rue Maraichers 13, CH-1205 Geneva, Switzerland; [Salzmann, Ulrich] Univ Northumbria, Dept Geog & Environm Sci, 2 Ellison Pl, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England; [Schwalb, Antje] Tech Univ Carolo Wilhelmina Braunschweig, Inst Geosyst & Bioindicat, Langer Kamp 19c, D-38114 Braunschweig, Germany; [Waldmann, Nicolas] Univ Haifa, Dept Marine Geosci, Haifa, Israel
推荐引用方式 GB/T 7714	Sylvestre, Florence,Schuster, Mathieu,Vogel, Hendrik,et al. The Lake CHAd Deep DRILLing project (CHADRILL) - targeting similar to 10 million years of environmental and climate change in Africa[J]. French National Research Institute for Sustainable Development,2018,24:71-78.
APA	Sylvestre, Florence.,Schuster, Mathieu.,Vogel, Hendrik.,Abdheramane, Moussa.,Ariztegui, Daniel.,...&Waldmann, Nicolas.(2018).The Lake CHAd Deep DRILLing project (CHADRILL) - targeting similar to 10 million years of environmental and climate change in Africa.SCIENTIFIC DRILLING,24,71-78.
MLA	Sylvestre, Florence,et al."The Lake CHAd Deep DRILLing project (CHADRILL) - targeting similar to 10 million years of environmental and climate change in Africa".SCIENTIFIC DRILLING 24(2018):71-78.